<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
	<title></title>
	<style type="text/css">
		*{
			margin: 0;padding: 0;
		}
		.box{
			position: fixed;
			right: 0;
			top: 0;
			left: 0;
			text-align: center;
		}
		.left{
			width: 200px;
			height: 200px;
			font-weight: bold;
			line-height: 30px;
			background: red;
		}
		.right{
			margin-left: 10px;
			height: 198px;
			border: 1px solid gray;
			background: blue;
			position: absolute;
			left: 200px;
			top: 0;
			right: 0;
		}
	</style>
</head>
<body>
    <div class="box">
    	<div class="left">左</div>
    	<div class="right">右</div>
    </div>
</body>
</html>